Turns out I basically got really unlucky a bunch of times with rare adds - eventually he spawned with two normals and it was (relatively) a straightforward fight. Oddly I didn't have all that much trouble in ice land, but now I keep getting double ambushed with rares in fire and it's hard going. Stun-stun-stun-dead. ~sigh~
And then I forgot about the skill cap thing, logged in, started fight, launched nuke and got a sort of little *phwee* instead of the expected *BOOM* and panicked
Training has now eaten all my gold.